added condition on keypress event

[ptchccnt2015]

adding this condition to catch if the currentKeyIndex is greater than or equal to 0 so that the logic inside won't execute

scenario: My list has

• Select Item
• Apple
• Maple
• Zipper

so my keys are ['s', 'a', 'm', 'z']

but when I press other keys that isn't in the list the logic still executes and selected the index 1 or the 2nd item in the list

and when I added currentKeyIndex >= 0 in line 356 the logic only runs when I press 's', 'a', 'm' or 'z'

I hope this will be approved or you could give me some workaround

thanks